#!/bin/bash
#this script tries to find all the files that are not seeded by rtorrent (in the download dir)
#It should deal with all filenames except those containing newlines $'\n' and probably $':' too :(
#It requires bash 3 and probably GNU/BSD sed

#find dirs
home_dir=~
rtorrent_temp_dir=$(sed -n 's/session[[:space:]]*=[[:space:]]\(.*\)/\1/p' ~/.rtorrent.rc)
rtorrent_download_dir=$(sed -n 's/directory[[:space:]]*=[[:space:]]\(.*\)/\1/p' ~/.rtorrent.rc)

#avoid the use of eval for ~ expansion
rtorrent_temp_dir=${rtorrent_temp_dir//\~/$home_dir}
rtorrent_download_dir=${rtorrent_download_dir//\~/$home_dir}

#want to use backreferences here but it's awfully slow :(
unset seeded_files i
while read -d $'\0' f 
do 
	strlen="$(strings "$f" | sed -n 's/.*name\([0-9]\+\).*/\1/p')"
	seeded_files[i++]="$(strings "$f" | sed -n 's/.*name'$strlen':\(.\{'$strlen'\}\).*/\1/p')"
done < <(find $rtorrent_temp_dir -mindepth 1 -maxdepth 1 -type f -iname \*.torrent -print0)

echo "theses files are unseeded..."
echo -e "size(MB)\tName"
while read -d $'\0' file
do
	flag=0
	for i in $(seq 0 ${#seeded_files[*]})
	do
		if [[ $(basename "$file") == "${seeded_files[$i]}" ]] ; then
			flag=1
			break
		fi
	done
	if [[ $flag -eq 0 ]] ; then
		du -ms "$file"
	fi
done < <(find $rtorrent_download_dir -mindepth 1 -maxdepth 1 -print0) #-print0 rules